Sirdar Emmanuel, Guimond Jean-Gilles, Coiteux Isabelle, Bélisle Sylvain, Babin Denis, Guertin Marie-Claude, Denault André
Department of Medicine, CHUM (Notre-Dame Hospital), 1560 Sherbrooke East, Montreal, Quebec H2L 4M1, Canada.
Intensive Care Med. 2004 Oct;30(10):1969-73. doi: 10.1007/s00134-004-2392-4. Epub 2004 Jul 28.
To determine whether mixed venous blood gas sampling obtained by pulmonary artery catheter (PAC) is influenced by the speed of withdrawal.
Prospective, observational study.
Surgical intensive care unit at a university hospital.
Twenty-five patients in the early postoperative period of cardiac surgery.
After verification of the adequate position of the PAC, measurements of mixed venous blood gas oxygen saturation, oxygen partial pressure (PO(2)), carbon dioxide partial pressure (PCO(2)), pH and bicarbonates were obtained at two different rates of withdrawal. A slow sampling was taken at a mean speed of 3 ml/min and a fast sampling at 18 ml/min for each patient. The mean difference in venous oxygen saturation between slow and fast samplings was -0.18+/-1.3%, venous PO(2): -0.2+/-1.3 mmHg, venous PCO(2): 0.1+/-0.9 mmHg, venous pH: 0+/-0.03, venous bicarbonates: 0.03+/-0.5 mmol/l.
Using the Bland & Altman method, we showed a satisfactory agreement between slow and fast mixed venous blood gas sampling techniques when measuring PO(2), oxygen saturation, PCO(2), pH and bicarbonates though a PAC.
确定通过肺动脉导管（PAC）采集的混合静脉血气样本是否受采血速度的影响。
前瞻性观察性研究。
一所大学医院的外科重症监护病房。
25例心脏手术后早期的患者。
在确认PAC位置合适后，以两种不同采血速度采集混合静脉血气样本，测量血氧饱和度、氧分压（PO₂）、二氧化碳分压（PCO₂）、pH值和碳酸氢盐。每位患者均以平均3 ml/分钟的速度缓慢采血及以18 ml/分钟的速度快速采血。缓慢采血与快速采血之间静脉血氧饱和度的平均差异为-0.18±1.3%，静脉PO₂为-0.2±1.3 mmHg，静脉PCO₂为0.1±0.9 mmHg，静脉pH值为0±0.03，静脉碳酸氢盐为0.03±0.5 mmol/L。
采用布兰德-奥特曼方法，我们发现通过PAC测量PO₂、血氧饱和度、PCO₂、pH值和碳酸氢盐时，缓慢和快速混合静脉血气采样技术之间具有良好的一致性。
